Question about Cobra 148 GTL 120-Channels Base CB Radio

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Puts out very little

I have a cobra 148 in my kw and it doesnt put out well. i put new antenna on and tried to calibrate and noticed the meter didnt move much

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Output transistor gone or power turned down on front control,

Posted on May 09, 2009

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2 Answers

CB warning antenna on a cobra 29 lx camo


You may have blown out the output transistor in the CB. Can you still calibrate the swr meter? The K 30 isn't really a very good antenna. The Lil Will isn't either. I'd try a K-40 or a better model Wilson antenna.

May 08, 2016 | Cobra Radio Communications

1 Answer

Swr meter manual


Check your antenna
are you using the correct antenna?
What kind of antenna are you using?
I recommend a dipole antena,at CB use 1.65 meters per side.
with RG 58 -50 Ohms
It is a very easy type of antenna and very,very cheap

Oct 15, 2013 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29XL: SWRs to high after calibrating according to the manual


tune your antenna not you radio. sounds like you don't have it grounded properly. new radio,new coax,and new antenna is the only way to do it right.make sure your antenna is at least 40" and it is adjustable with a set screw.

Dec 06, 2012 | Cobra Radio Communications

1 Answer

I have a new cobra 148 with ssb, about 6 months old, while i was away there was a storm, now the radio doesnt work , recieve or transmit, i also have a cobra 29 ltd that wont transmit but it will recieve....


make sure the mic is good. If for some reason the mic went bad, it will not receive or transmit.

As for the one with no receive, it most likely needs a new final.

If lightning hit your antron, it would be in pieces.

Aug 02, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Have a cobra 148 gtl cb/ssb. It is brand new. I hvae it hooked up and have tuned the antenna using the swr meter on the cb. I habe channel 1 and channel 40 metting at about 1.6 swr. I have what appears to...


Hi, my name is John. Welcome to FixYa. Check your antenna, you need to set it with a real SWR meter, pick one up at any near-by CB shack $10.00. Thanks for choosing Fixya...John

Jul 22, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

4 Answers

Have not used my cobra for some time ...sine someone need my K40 antennae more than me. Just put it back in service with a new magnet mount 36 inch - can send and receive in USB and LSB ....can here in the...


Center the antenna on the vehicle, then check the SWR on channel 1 and channel 40.
with the switch in CAL position, key radio and use the swr/cal knob to set the meter so the needle is just touching the end of the red area on the right-hand side of the meter.
Once calibrated, unkey and switch the switch to SWR and key up again. The lower the reading, the better. If the SWR is Higher on 40, the antenna needs to be shorter.. if its higher on 1, then the antenna needs to be longer.

if it dont transmit period on AM, then there's an internal glitch :)

Jan 24, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Cobra 29 ltd classic ant light


Your SWR is probably NOT fine. You need to use an external meter if you have had work done to the radio. Especially if you have had a swing mod done to the radio. When you do this, the dead key of the radio is lower then the calibration knob on the radio can adjust for. It will always come up lower then it actually is.

Your radio might have been fine before the work was done on it because it was putting out very little power. Now you are most likely putting out 50 watts or more. Big jump from 4 watts.

When your raise the power in a radio, you will notice more when the antenna is not properly tuned.

In most cases with a stock CB, even when the antenna is not even near tuned, you will get a reading less then 1.5 anyway.

the more power you put out, the more important it is to have a good match.

But an external SWR meter, and check it. be careful if the ANT light is on.

You might also want to check your coax, connections to it, and your antenna for anything wrong.

Apr 22, 2009 | Cobra 29 LTD CB Radio

3 Answers

Cobra 29 ltd classic antenna calibration ??


You should not calibrate the antenna before you install it on the car!! the antenna needs to be calibrated on the vehicle that it is going to be on. Type of vehicle, different mounts, and many other variables can change the amount of reflection you will get.

j0hn9999 did a much better job but left some info out.

Take your SWR readings on channel 1, then on channel 40.... NOW, if your SWR is higher on ch 40 then ch 1, then your antenna is too long and it needs to be shortened. Refer to the antenna instructions on how to shorten the antenna.

If your SWR is higher on ch 1 then on ch 40 then your antenna is too short. You must lengthen the antenna. Again refer to your antenna instructions on how to lengthen your antenna.

You must calibrate each time you take a reading.

Make sure your doors and windows are shut when taking a reading

Make sure you are in an open lot when taking a reading as buildings, trees and other structures can cause reflection and give you an inaccurate reading.

If you adjust the length of your antenna on another vehicle and then put it on yours, the SWR will be off. It will need to be tuned again.

An external meter is better then the one in the radio, but will need to be hooked up in the vehicle you have the antenna on.

If you are not running any kind of power, or do not have a swing kit installed, and the radio is stock, the meter in the radio is more then enough to get a correct SWR reading.

Sep 27, 2008 | Cobra 29 LTD CB Radio

1 Answer

Cobra 148GTL


Hello k007,

It sounds like you may have damaged the RF power amplifier stage of the CB. Since you were adjusting the antenna characteristics. Did you have a SWR (Standing Wave Ratio) meter connected while you were tuning the unit? If you did you might have noticed the needle go past the 1.2 mark when you were adjusting the antenna or the unit itself. In any event I think that the RF power Amp is shot.

Thank you,
Shuttle83

Nov 04, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 29GTL Won't Transmit


if the red ant light comes on this means that you have antenna trouble either in the antenna itself or the coax but this should not have anything to do with the radio not transmitting. it sounds to me that you have a bad audio chip or a bad power output transistor. in either case you should really take it to a cb shop and let the professionals solve your problem, good luck!!

Aug 16, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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